Cleaning device for water-cooled-wall furnaces.



J. RENNIE. CLEANING DEVICE FOR WATER COOLED WALL FURNACES.

APPLICATION FILED FEB. 21, 1912.

Patented Aug. 6, 1912.

INVENTORI- J. L IV I 1p 41 1 m m y L 5 1 9 fi l MM 'WITNESSESI Mw GEORGEJ". RENNIE, OF ASPINWALL, PENNSYLVANIA.

CLEANING DEVICE FOR WATER COOLED-WALL FURNACES.

Specification of Letters Patent.

Patented Aug. 6, 1912.

Application filed February 21, 1912. Serial No. 679,197.

I have illustrated the invention in the accompanying drawing as appliedto such furnaces now in'use, but it will be understood that theinvention makes possible the use of much deeper and more extendedcooling envelops on such furnaces.

Figure l is a vertical central section of the furnace with my inventionapplied, and Fig. 2 is a detail view of the operating en of the mudsucker I employ.

It will be understood that blast furnaces with thin brick walls lined onthe outside with' metal plates are possible only when there isprovidedsufficient means for cooling the wall. Experience has shown thatthis cooling is best done by a multiple series of annular narrow troughsencircling the furnace and overlapping, and that the water I iii-thesetroughs must circulate at a particular low speed in order-to keep? thewater from getting too cold; That is, while it is economical to allowthe water to retain as much heat as possible without burning the bricklining, it is'disastrous to-have' the temperature change suddenly, andthe water mustnot get' too cold because of injurious effects as well asbecauw itcarries off and wastes the heat. The water cannot be.

forced throughthe troughs with sufficientrapidity to clean out themud'and detritus that necessarily collects in their bottoms, and it hasheretofore been possible to clean the mud out of the troughs withoutstoppingthe furnace only by slow, laborious, and

inefficient dippingfwith longhandled spoons and shovels. Q I

My invention is the result of recognizing that the mud mustbe taken outwithout Itherefore provide an efficient sucking device and a mounting ofpipes and platforms by which a flexible hose can be used in this way.

. In the drawing the wall 3 of the furnace is covered on the outsidewith a series-of overlapping troughs 4C, 4, 4, 'etc., in which,

the water is continually maintained by means of a series of feed-pipes5, shown at the right, and supplied by main water pipe 6. The water fromeach of the troughs atsorne point overflows by pipe 7 into the bottom ofthe next succeeding trough, so that the mud is deposited at the bottom,as well as to keep the water in the troughs at a uniform temperaturethroughout its volume. It will be understood that the mud usuallycollects at the bottom point of the trough.

I provide on the structure of the furnace, as on the uprights 8, aseries of plat-forms 9, preferably, but-not necessarily surrounding thefurnace, and in proximity with this a series of upright drawofi pipes10, 10, supplied at convenient intervals with nipples 11, 11, havingclosing valves and means to attach a flexible hose 12, so that a workmanwalking along the platform 9 can insert the hose to the bottom, of thetrough and by aslow stepping movement sink the end of the hose intothemud and progressively draw it out all around the annular trough InFig.2 I have shown my preferred form of the sucking nozzle 13 for theflexible hose 12. It should be made of brass and should be provided withan elongated series of vertical openings l3 and also lateral openings 13and may be attached to the hose in any convenient manner. All of thesuction pipes 10 lead to a chamber 14 made in the form of a steaminjector in any usual Way. As shown, the steam pipe 15 provides a jetthrough the restricted opening 16 and draws the mud and water throughthe pipe 10, as will be understood. By this means I am enabled tocontinually remove the collected mud from the bottom of the coolingtroughs,

without stirring it up and without "requiring space for a hoe or othertool. It will be seen, therefore, that the cooling troughs may be madevery narrow and very deep, and the operation of cleaning them may becarried on without disturbing the proper temperature conditions, soessential to the operation of .such furnacesl The particular form ofpump for draw ing off the mud is not essential, but the advantages of myinvention flow from the combination of the trough cooled furnace withmeans for removing the mud Without agitation directly from the bottom ofthe troughs and progressively around them.

Other advantages of the device will occur t those familiar With the art.

Having thus described my invention and illustrated its use, What I claimis the foll'nving:

1. The combination with a furnace having Water cooled Walls, comprisinga series of overlapping water troughs, of a suction pump mounted nearthe furnace, inlet pipes t said pump having attachments at variousheights, a flexible pipe and suction nozzle adapted to be thus connectedto said pump inlets at various positions, and supports to enable thecarrying of said nozzle around the furnace at any point, substantiallyas described.

2. The combination of a furnace having narrow, overlapping, annularWater troughs on its outer surface, of a pump, pipe connections to saidpump, and a sucker nozzle adapted for attachment thereto at variouspositions and for movement progressively around the bottom of saidtroughs, substantially as described.

In testimony whereof I have hereunto subscribed my name in the presenceof the subscribing Witnesses.

GEORGE J. RENNIE.

Witnesses:

FREDK. STAUB, Jo. BAILY BROWN.

